<template>
  <div class="login">
    <vue-particles class="login-bg" color='#39AFFD' :particleOpacity="0.7" :particlesNumber="100" shapeType="circle" :particleSize="4" linesColor="#8DD1FE" :linesWidth="1" :lineLinked="true" :lineOpacity="0.4"
      :linesDistance="150" :moveSpeed="3" :hoverEffect="true" hoverMode="grab" :clickEffect="true" clickMode="push">
    </vue-particles>
    <!-- 登录面板 -->
    <div class="login-box">
      <div class="login-box-title">
        源流后台管理系统
      </div>
      <div class="login-box-from">
        <el-form :model="loginForm" :rules="rules" ref="loginForm" class="demo-ruleForm">
          <el-form-item prop="username">
            <el-input v-model="loginForm.username" placeholder="请输入用户名" size="medium">
              <el-button slot="prepend" icon="el-icon-user"></el-button>
            </el-input>
          </el-form-item>
          <el-form-item prop="password">
            <el-input v-model="loginForm.password" placeholder="请输入密码" size="medium">
              <el-button slot="prepend" icon="el-icon-key"></el-button>
            </el-input>
          </el-form-item>
          <el-form-item>
            <el-button type="primary" size="medium" :loading="loading" style="width:100%" @click="submitForm('loginForm')">立即登陆</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>

  </div>

</template>

<script>
export default {
  data() {
    let letterRule = (rule, value, callback) => {
      let reg = /^[a-zA-Z0-9_-]{4,18}$/
      if (value === '') {
        callback(new Error('输入内容不能为空'));
      } else if (!reg.test(value)) {
        callback(new Error('请输入字母、数字、下划线'));
      } else {
        callback();
      }
    };
    return {
      loading: false, //登陆状态
      loginForm: {  // 登陆表单
        username: 'admin',
        password: '123456'
      },
      rules: {  //登陆验证规则
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 2, max: 18, message: '长度在 2 到 18 个字符', trigger: 'blur' },
          { validator: letterRule, trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 16, message: '长度在 6 到 16 个字符', trigger: 'blur' },
          { validator: letterRule, trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    submitForm(formName) {
      this.$refs[formName].validate((valid) => {
        if (valid) {
          this.loading = true
          this.login()
        } else {
          // console.log('error submit!!');
          return false;
        }
      });
    },
    login() {
      this.$store
        .dispatch('user/login', { username: this.loginForm.username })
        .then(() => {
          this.loading = true
          // 登陆成功后重定向
          this.$router.push({
            path: this.$route.query.redirect || '/index'
          })

        })
        .catch(err => {
          this.loading = true
          // console.log(err)
        })
    }
  }
}
</script>

<style scoped>
.login {
  width: 100%;
  height: 100%;
  /* display: flex;
    justify-content: center;
    align-items: center;
    background-image: url('../../assets/image/login.jpg');
    background-repeat: no-repeat;
    background-size: 100% 100%;
    color: #cccccc; */
  position: relative;
}
.login-bg {
  width: 100%;
  height: 100%;
  background: #3e3e3e;
}
.login-box {
  width: 350px;
  /* height: 287px; */
  background: hsla(0, 0%, 100%, 0.3);
  border-radius: 5px;
  box-shadow: 0 0 2px #f7f7f7;
  border: 1px solid #f7f7f7;
  position: absolute;
  left: 50%;
  top: 50%;
  margin-left: -175px;
  margin-top: -150px;
}
.login-box-title {
  line-height: 50px;
  font-size: 20px;
  color: #ffffff;
  text-align: center;
  border-bottom: 1px solid #ffffff;
}
.login-box-from {
  width: 100%;
  height: auto;
  padding: 30px;
  box-sizing: border-box;
}
</style>